| # Copyright 2014 The Chromium Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| import csv |
| import logging |
| |
| from telemetry.internal.platform.power_monitor import android_power_monitor_base |
| |
| class DumpsysPowerMonitor(android_power_monitor_base.AndroidPowerMonitorBase): |
| """PowerMonitor that relies on the dumpsys batterystats to monitor the power |
| consumption of a single android application. This measure uses a heuristic |
| and is the same information end-users see with the battery application. |
| Available on Android L and higher releases. |
| """ |
| def __init__(self, battery, platform_backend): |
| """Constructor. |
| |
| Args: |
| battery: A BatteryUtil instance. |
| platform_backend: A LinuxBasedPlatformBackend instance. |
| """ |
| super(DumpsysPowerMonitor, self).__init__() |
| self._battery = battery |
| self._browser = None |
| self._platform = platform_backend |
| |
| def CanMonitorPower(self): |
| result = self._platform.device.RunShellCommand( |
| ['dumpsys', 'batterystats', '-c'], check_return=True) |
| DUMP_VERSION_INDEX = 0 |
| # Dumpsys power data is present in dumpsys versions 8 and 9 |
| # which is found on L+ devices. |
| return (csv.reader(result).next()[DUMP_VERSION_INDEX] in ['8', '9']) |
| |
| def StartMonitoringPower(self, browser): |
| self._CheckStart() |
| assert browser |
| self._browser = browser |
| # Disable the charging of the device over USB. This is necessary because the |
| # device only collects information about power usage when the device is not |
| # charging. |
| |
| def StopMonitoringPower(self): |
| self._CheckStop() |
| assert self._browser |
| package = self._browser._browser_backend.package |
| self._browser = None |
| |
| voltage = self._ParseVoltage(self._battery.GetBatteryInfo().get('voltage')) |
| power_data = self._battery.GetPowerData() |
| power_results = self.ProcessPowerData(power_data, voltage, package) |
| self._LogPowerAnomalies(power_results, package) |
| return power_results |
| |
| @staticmethod |
| def ProcessPowerData(power_data, voltage, package): |
| package_power_data = power_data['per_package'].get(package) |
| if not package_power_data: |
| logging.warning('No power data for %s in dumpsys output.' % package) |
| package_power = 0 |
| else: |
| package_power = sum(package_power_data['data']) |
| |
| return {'identifier': 'dumpsys', |
| 'power_samples_mw': [], |
| 'energy_consumption_mwh': power_data['system_total'] * voltage, |
| 'application_energy_consumption_mwh': package_power * voltage} |
